How to Calculate Your Amazon FBA Profits in 2026
Profit per unit = Selling Price - Product Cost - Referral Fee - Fulfillment Fee - Storage Fee - Other Costs
TL;DR (Quick Formula)
Profit per unit = Selling Price - Product Cost - Referral Fee - Fulfillment Fee - Storage Fee - Other Costs
Using 2026 rates: For a $35 product costing $12 with 1.2 lb weight selling 100 units/month: Profit = $35 - $12 - $5.25 (15% referral) - $2.56 (fulfillment) - $0.12 (storage) = $14.97 per unit. Multiply by expected monthly sales for monthly profit. Always use current 2026 fees—January 2026 fees increased.
Why Profit Calculation Matters
Many new Amazon sellers list products without calculating true profitability. They see a $15 sale price and $8 cost and think they're making $7 profit. But once you account for Amazon fees, fulfillment, storage, and refunds, that $7 vanishes.
Correct profit calculation catches problems before you invest money.
Example: A product listed at $30 with $10 cost might look good. But after fees:
- Cost: -$10
- Referral (15%): -$4.50
- Fulfillment: -$2.56
- Storage: -$0.30
- Actual profit: $12.64
Positive. But if you miscalculated and forgot fulfillment, you'd think profit was $15. Massive difference.
The Complete FBA Profit Formula
Profit per unit = Selling Price - COGS - Referral Fee - Fulfillment Fee - Storage Fee - Returns/Refunds - Miscellaneous
Let's break down each component:
Step 1: Selling Price
This is the price customers pay on Amazon (including tax if applicable).
You control this. Use competitive research to set price.
Example: Water bottle sells for $35
Step 2: Cost of Goods Sold (COGS)
What you paid the supplier for the product.
Be honest about this. Include:
- Supplier cost per unit
- Shipping from supplier to you (freight)
- Any import duties or tariffs
- Labeling/packaging added by you
Example: Supplier charges $8, shipping to you is $1/unit (all in), import duties are negligible.
COGS = $9 per unit
Step 3: Amazon Referral Fee
Amazon takes a commission on every sale. This varies by category.
2026 Referral Rates:
| Category | Rate |
|---|---|
| Electronics | 8% |
| Appliances | 8% |
| Books | 15% |
| Clothing, Shoes | 17% |
| Sports & Outdoors | 15% |
| Kitchen & Dining | 15% |
| Home & Garden | 15% |
| Toys & Games | 15% |
| Beauty | 15% |
| Most categories | 15% |
Calculation: Selling Price × Referral Rate
Example: $35 × 15% = $5.25
Step 4: FBA Fulfillment Fee
Amazon charges per unit for picking, packing, shipping, and returns handling. Depends on weight and size.
January 2026 Rates (Standard-Size Items):
| Weight | Fee |
|---|---|
| Up to 1 lb | $2.41 |
| 1–1.3 lbs | $2.56 |
| 1.3–2 lbs | $2.71 |
| 2–2.5 lbs | $2.87 |
| 2.5–3 lbs | $3.05 |
| 3–3.5 lbs | $3.34 |
For oversized (>20 lbs or one dimension >18"): $8–$15 depending on weight
Note: Rates increased January 15, 2026. Use these numbers, not 2025 or earlier rates.
Example: Product weighs 1.2 lbs = $2.56 fulfillment fee
Step 5: FBA Storage Fee
Amazon charges monthly for warehouse space. Cost per cubic foot, and fees triple during Oct–Dec peak season.
Calculate Your Product's Cubic Feet:
- Measure product dimensions in inches
- Multiply: Length × Width × Height = cubic inches
- Divide by 1,728 = cubic feet
Example: Water bottle box is 10" × 8" × 6" = 480 cubic inches ÷ 1,728 = 0.28 cubic feet
Calculate Annual Storage Cost:
Jan–Sept rate: $0.87 per cubic foot Oct–Dec rate: $2.60 per cubic foot
Example:
- Jan–Sept (9 months): 0.28 × $0.87 × 9 = $2.19
- Oct–Dec (3 months): 0.28 × $2.60 × 3 = $2.18
- Total annual storage: $4.37
Amortize Over Units Sold:
Storage cost is fixed annually, but you divide it by monthly sales to get per-unit cost:
Monthly sales: 100 units
- Annual storage: $4.37
- Per-unit storage: $4.37 ÷ (100 × 12) = $0.036 per unit
Monthly sales: 10 units (slower product)
- Annual storage: $4.37
- Per-unit storage: $4.37 ÷ (10 × 12) = $0.36 per unit
For our example (100 units/month): $0.036 storage fee per unit
(Simplified: approximately $0.04/unit)
Step 6: Returns & Refunds
This is critical and often forgotten.
Expect 5–15% of sales to be returned (varies by category):
- Electronics: 10–15% return rate
- Clothing: 20–30% return rate
- Home goods: 5–10% return rate
- Most other categories: 5–8% return rate
When a customer returns:
- You lose the referral fee (good news)
- You lose the sale (bad news)
- You regain the fulfillment fee (good news) — Amazon refunds it when return is processed
- Product goes back to your inventory (it's usually fine to resell)
Net impact of a return:
- Lost sale price: -$35
- Refund referral fee: +$5.25
- Refund fulfillment fee: +$2.56
- Regain COGS: ±0 (product is back in inventory)
- Net loss: $27.19
With a 10% return rate:
- Per 100 units, 10 are returned
- 10 × $27.19 = $271.90 loss
- Spread across 100 units: $2.72 per unit
Example for our water bottle (assuming 8% return rate): $2.24 per unit loss
Step 7: Miscellaneous Costs
Other costs to consider:
- Advertising: Amazon ads cost 5–15% of revenue for competitive products
- Returns shipping: If customer returns damaged item, you might absorb some cost (minimal with FBA)
- Prep/labeling: FNSKU labels, packaging materials, pre-FBA prep (~$0.05–$0.10/unit)
- Taxes: Sales tax varies by state (you collect/remit)
For conservative calculation: estimate 2–5% miscellaneous/advertising overhead.
Example: $35 × 5% = $1.75 per unit
Putting It All Together: Real Example
Product: Insulated Stainless Steel Water Bottle
| Component | Calculation | Amount |
|---|---|---|
| Selling Price | $35.00 | |
| Less: COGS | $9/unit | -$9.00 |
| Less: Referral | $35 × 15% | -$5.25 |
| Less: Fulfillment | 1.2 lbs | -$2.56 |
| Less: Storage | 0.28 cf, $4.37 annual ÷ 1,200 units | -$0.04 |
| Less: Returns (8%) | 8% × 35 × 0.92 | -$2.24 |
| Less: Misc/Ads | 5% buffer | -$1.75 |
| PROFIT PER UNIT | $14.16 |
At 100 units/month: $1,416/month profit
How Sales Volume Changes Profitability
The same product is more or less profitable depending on monthly sales:
Scenario: 50 units/month
- Storage cost per unit: $0.08 (doubled)
- Returns impact: Same
- Profit per unit: $14.12
- Monthly profit: $706
Scenario: 100 units/month
- Storage cost per unit: $0.04
- Returns impact: Same
- Profit per unit: $14.16
- Monthly profit: $1,416
Scenario: 200 units/month
- Storage cost per unit: $0.02 (amortizes better)
- Returns impact: Same
- Profit per unit: $14.18
- Monthly profit: $2,836
Scenario: 500 units/month
- Storage cost per unit: $0.01
- Returns impact: Same
- Profit per unit: $14.19
- Monthly profit: $7,095
Key insight: Higher sales volume makes the same product more profitable (storage costs amortize better).
Quick Profit Calculator Template
Use this template to calculate your products:
| Line Item | $ |
|---|---|
| Selling Price | |
| Less: COGS | |
| Less: Referral (use %) | |
| Less: Fulfillment (weight) | |
| Less: Storage (annual ÷ monthly units) | |
| Less: Returns (estimate 8%) | |
| Less: Ads/Misc (5%) | |
| = PROFIT PER UNIT | |
| × Monthly Sales Volume | |
| = MONTHLY PROFIT |
When Is a Product Worth FBA?
Use this decision framework:
Profit per unit > $5? → Worth considering FBA
Monthly sales >30 units? → FBA costs amortize reasonably
Prime badge essential (electronics, clothing)? → FBA is necessary
All three yes? → FBA is viable
Example products:
✅ Water bottle:
- Profit: $14.16/unit
- Sales: 100 units/month
- Category: Home goods (Prime helpful)
- Decision: FBA is excellent
❌ Low-cost pen:
- Profit: $0.50/unit
- Sales: 50 units/month
- Category: Stationery (Prime not critical)
- Decision: FBA not viable (fulfillment fee > profit)
✅ Smart home device:
- Profit: $25/unit
- Sales: 75 units/month
- Category: Electronics (Prime critical)
- Decision: FBA is ideal
Common Profit Calculation Mistakes
Mistake 1: Forgetting Fulfillment Fees
Error: Calculating profit without the $2.41–$3.34 fulfillment fee
Impact: Overstating profit by $2.50/unit. On 100 units, you're wrong by $250.
Fix: Always include fulfillment fee based on exact weight.
Mistake 2: Using Old 2025 Fee Rates
Error: Using pre-January 2026 fulfillment fee rates
Impact: Fees increased in January 2026. Using old rates understates costs.
Fix: Use the 2026 rates from this guide.
Mistake 3: Ignoring Storage Costs
Error: "Storage is only a few dollars per month, negligible"
Impact: For slow-moving products, storage cost per unit adds up ($0.36/unit for products selling 10/month).
Fix: Always calculate cubic footage and amortize over expected monthly sales.
Mistake 4: Not Accounting for Returns
Error: Assuming 100% of sales are keepers
Impact: Return rate of 8–15% reduces profit by $2–$4/unit depending on category.
Fix: Reduce profit by 8–10% to account for returns.
Mistake 5: Using List Price Instead of Net After Discounts
Error: "Product sells for $35, so use $35"
Impact: If you run sales/discounts, actual average selling price is lower. Overstates profit.
Fix: Use weighted average selling price accounting for discounts/promos.
Tools for Profit Calculation
Manual calculation: Use the template above with a spreadsheet
Ecom Circles Scanner: Input product details, weight, expected sales, and the platform automatically calculates:
- FBA fulfillment fees (2026 rates)
- Storage costs
- Referral fees by category
- Estimated profit margins
- Comparison vs. FBM
This saves hours of manual calculation and ensures current fee rates.
About Ecom Circles
Ecom Circles automatically calculates true FBA profitability for your products. Input your product list, and our platform shows profit margins including all 2026 fees, storage costs, and return rates. No more manual spreadsheets. Start your 14-day free trial →
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